Ticket #28319: 28319.5.diff

src/wp-includes/class-wp-error.php

@@ -59 +59 @@
                 if ( empty($code) )
                         return;
 
-                $this->errors[$code][] = $message;
-
-                if ( ! empty($data) )
-                        $this->error_data[$code] = $data;
+                $this->add( $code, $message, $data );
         }
 
         /**
@@ -222 +219 @@
          */
         public function add($code, $message, $data = '') {
                 $this->errors[$code][] = $message;
+
                 if ( ! empty($data) )
                         $this->error_data[$code] = $data;
+
+                if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
+                        /**
+                         * Fires when an error is added to a WP_Error object.
+                         *
+                         * @since 4.1.0
+                         *
+                         * @param WP_Error $this The WP_Error instance.
+                         */
+                        do_action( 'add_wp_error', $this );
+                }
         }
 
         /**